Chaga mushrooms are a birch-tree fungus from cold climates that people have used for centuries, and they’re now commonly consumed as tea or supplements. Animal and test-tube studies suggest chaga ...
Sleep happens in cycles that include three non-rapid eye movement (NREM) stages and one rapid eye movement (REM) stage, repeated 4 to 5 times nightly. Each cycle typically lasts 90 to 110 minutes. The ...
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